Mostly screw, drinking sparkling wine: one could be at mine (9)
I believe the answer is:
excavator
'at mine' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'mostly screw drinking sparkling wine one' is the wordplay.
I cannot quite see how this works, but
'wine' could be 'cava' (type of Spanish wine) and 'cava' is found in the answer.
This explanation may well be incorrect...
'could be' is the link.
Can you help me to learn more?
(Another definition for excavator that I've seen is " Powered machine for digging earth".)